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Quasi-biennial geomagnetic variation caused by the sunClear evidence for the existence of a quasi-biennial geomagnetic variation is shown by an analysis of annual averages of the horizontal (H) component of the geomagnetic field observed at five observatories. The analysis uses a numerical filter, which is equivalent to taking the second order time derivative of the time series. The cause for the variation is external to the earth because its amplitude depends on magnetic activity. The second order time derivative of H is well correlated with the corresponding time derivatives of the relative sunspot number and 10.7 cm solar flux. It is suggested that quasi-biennial oscillations observed in the geomagnetic field, cosmic rays, stratospheric zonal wind and temperature, total ozone, and other meteorological parameters could be produced by a common cause on the sun.
Document ID
19770032924
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sugiura, M.
(NASA Goddard Space Flight Center Laboratory for Planetary Atmospheres, Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
November 1, 1976
Publication Information
Publication: Geophysical Research Letters
Volume: 3
Subject Category
Geophysics
Accession Number
77A15776
Distribution Limits
Public
Copyright
Other

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